Tool-operating mechanism for lathes.



J. C. POTTER & J. JOHNSTON.

TOOL OPERATING MECHANISM FOR LATHES. APPLICATION FILED MARJ, 1903.

1,0074%, Patented Oct. 31, 1911.

2 SHEETS-SHEET 1.

J. G. POTTER 6; J. EQHNSTON.

v TOQL OPERATING MECHANISM FOR LATEES.

APELIGATIGZH FILED MABHZ, 1903.

Patented 0015.31, 1911.

2 SHEETS-SHEET 2.

hereinafter specified .er' at-ing the cross-slide; and,

4 the axis of pair shares T 't hit ASSIGNORS TO POTTER &

or rew'rucnnr, razors ISLAND, commas, or rawrncanr, anonn rocnoenaa'rme rancrmmsm res Leanne.

- Specification cf Letters Patent.

Patented o e. 31, rear.

Application filed March 7, 1903. Serial No. 148,725.

To all whom it may concern:

Be it known that we, James G. POTTER, a citizen of the United States, and JOHN JOHNSTON, a subject of the King of England, of Pawtucket, in the county of Providenee and in the State of Rhode Island, have invented a certain new and useful Improvement in Tool Operating Mechanism for Lathes, and do hereby declare that the following is a. full, clear, and exact description thereof, reference being had to the accompanying drawings, in which- Figure 1' is a top, plan view of enough of a turret lathe to illustrate our-invention;

Fig. 2 is a side elevation thereof; Fig. 3 is a cross-section on the line 3-3 of Fig. 1;

Fig. 4 is a section on the line -i4 of Fig. 1; Fig. 5 is a detail view, in section, of the arm-latching device. Fig. 6 a detail View in cross section, partly in elevation, of the cross-slide actuating devices; Fig. 7 is a detail view showing the pinion engaging with a rack on the cross slide; Fig. 8 is a like view showing the racks and pinion -for op- Fig. 9 is a detail plan view of the two tappets of the cross-slide operating mechanism.

Our invention relates to lathes in which automatically operated cross-slides are employed, and the object of our invention is to simplify the mechanism for producing the movements of the cross-slide, and to prevent tool marks on the work, duced by the-dragging of the tool across the face of the work, and to these ends, our invention consists in the mechanism having the features of construction substantially as and claimed.

The lathe which we have selected to illustrate an embodiment of our invention is of the well-known turret type, having a tool carrying turret A mounted upon a main slide B that. is reciprocable toward and from the work in a direction parallel with the head-stock spindle. As the construction of the turret and the mechanism by which the main slide is operated form no part of the present invention, they will not he described. The cross-slide C is mounted upon a carriage I) that is slidable toward anrl'trom the Work on suitable ways on the upper side of the frame or bed of the lathe. The carriage D may be shifted which are proto the desired position by hand. Attached to the cross-slide, at the lower side thereof, is a rack bare, with which meshes a pinion E on a vertical shaft F journaled in bearings in the carriage D. Beneath the ainion E on the. shaft F is a second pinion (it, and meshing with the latter at opposite sides thereof are two rack-bars H andlI that extend at right angles to the cross-slide and its rack-bar m The rack-bars H and I are attached to, or are extensions of, rods 5 and K, respectively, which at their opposite ends pass loosely through and are supported by a bracket L on the bed of the lathe. It will be seen that by the reciprocation of either of the rods, the cross-slide will be recipr cated and the tools thereon moved to perform their Work and then retracted. There are two rods and rack-bars provided, because, usually, there are two tools on the cross-slide which act upon the Work from opposite sides of the head-stock spindle, one rod and rack-bar thus serving 'to move one tool to perform its'work and then to retract it, and the other rod and rack bar serving the like purpose for the second. tool. 0n the rods J and K are similar blocks and/l1, respectively, that are secured to the rods'by clamps, so that they maybe adjusted along the same, each block having on one side a simple inclined. surfacepand on the opposite side a notch or cavity, of a V-shape preferably." 'Also 'on said rods are two collars j and 7c, respectively, lengthwise adjustable along the rods, and a cross-bar M that" extends from one rod to the other and is free to slide thereon and is designed tor-hut, against thetwo collars j and is. Pivoted to a lateral ex tension or projection b of the main slide B is a horizontally swinging arn N, having projecting downward from its extremity a lug a adapted to co-act witheither of the blocks or tappcts j and 7c, and the extremity of said arm being adapted-to engage the cross-bar M. When the lugolfthe arm N engages the notched side'oii the, of'the tappets and is moved in the proper direction, being carried by the main slide, it will be seen that it will carry with it the rod to which said tappet is secured, and thus through the racks and 'pinions move the.

cross-slide in one direction. When moved in the reverse direction, the end ol. the oror tool on the for side of the cross-slidechas its; 35 movements eiiected by the rod J, it being;

moved to do its Work when the torrent csrriege moves toward the head stock, While "the moven'ients of the tool on the inner side are effected by the rod K. lhe collars y" and in with which the crossbar ld coects to effectthe retraction of the rods J and K are given such position ivith reference to the travel of the turret sliCe or carriage that when one rod is not being used, and is fully retracted, While the other rod. is being: used, the position of the collar of the rod not being used will agree with the fully retracted position of the turret slide, so that the cross-bar M will cease its retracting movement when it shuts against the stud collar of the rod not being; used.

The arm N is mounted on pivot shaft. n having in its side a ll-shaped. notch 12 for cooperation with e spring pressed pin 0, 5 slidnbly mounted in. a hole in e'lziteral tension of the. turret slide. The pin 0 pressing at its outer end on a redial Well of the notch n and having its side engaged by the other well of the notch, yieldingly 40 holds the arm ll in position to en ree the teppet is. F or swinging the arm N in position to engage the other of the tappets, a. lever P is attached to the shaft n, and has its free end in position to he engaged by e pivoted block or buttonQ carried by the turret, said button, by the revolution of the turret, being moved to and from position to engage said lever, and thus the time of opoperetion of the crossslide tool being auto-- meticallv determined by the turret. The button Q has such form that, when turned in one position, it will cause the lever to sivingto place the arm so that it will engage one of the tappets, and when turned to another position, it Will cause the lever to place the ,erm for engagement with the other tep ict, the button being tnrnedfrom one posltwn to another by hand, according as it is desired to use one tool on the so cross-slide or the other tool tl'iereon. C ne or any number of buttons can be attached to the turret, according to the number of times it is desired that the cross-slide shall he moved dtiri'ng the complete revolution of the turret. l fhen the arm N is on that side of the toppets Where they have simple inclined sin-feces, end the erin by the movenent oitthe slide is moved toward the toppets, its end, if it beset by the button to coast with one or the other cl the tsppcts, will engage the inclined side of such tappet and the arm thereby swung sidevvise to permit it to pass to the opposite side of the teppet, in readiness to engage therewith on the movement of the main slide in the opposite direction. I

llt will be seen that the time tor the automatic ITLGVQKHGIil? of the cross-slide is automatically lined, and that by means of our mechanism the ineinslide operating devices are availed of to etlect the reciprocation of the ClOSS-Sll[l, separate operating mocha nisni for moving the erossslide being thus rendered unnecessary.

Attached to, end extending from, the cross-slide carriage l), toward the heedstoclt, end parallel with the headstock spindle exis, is e threaded rod or screw ll,

which passes l eely through on eye in c bracket S fastened to the side of the lathe bed. On the screw on opposite sides of the bracket-eye are nuts '1, separated e sulli" ciently greater LilSiitlllCG than the length of the eye, to permit movement of the rod or screw before the nuts strike said eye. By reason of devices just described, when one of the rock bars isinoved to operate the cross-slide to cause one of its tools toilet on the Work, the cross-slide carriage will first be bodily moved toward the head-stock, and

when the not next the carriage strikes the bracket-eye s, such movement of the crossslide carriage will be arrested, and then. the reek-bar, acting on the pinion, Will cause traverse of the tool. across the Work to perform its cutting operation. iifhen the cross-slide tool to he retracted, the reverse movement of the operating reek-bar Will first result in the bodily movement of the cross-slide carriage away from the head- Stock longitudinally of the bed until the not T onv the opposite side of the bracket-eye e engages the letter, whereupon backward movement of the cerriege being arrested, the

cross-slicle will be moved, cerrying the tool to its former position, end, as the tool will have thus beemcsrried evvsy from the Work at distance eqltel to the dillerence between the length of the lirecketeyc and the space between the nuts '1? the tool will not touch the Work in being retracted, and thus no tool merit on the Work will be formed.

The described bodily movement of the cross slide carriage toward and from the WOIl'I is due to the feet that the resistance to cross-Wise movement oi the cross slide by the notion of the racks end pinions is greater then the resistance of the cross-slide carriage along the lathe bed toward and from the Work. That to soy, the bodily movement of the cross-slide carriage toward and from the work longitudinally of the bed takes place first, and must be arrested before the revolution of the pinion's can take a place, which is necessary" to move the crossslide laterally The rods J and K are not attached to the carriage D, but they are free to move in ependently thereof, except when resistance oltered by" the cross 19 slide to lateral movement is suffic ent to pre vent rotation ofthe pinions G. and E by the action of one or the other rod.

Having thus described ear invention what we claimis I 1. In a. lathe, the combination of two slides monnted independently of each other, at turret. on one of the slides, means torcausing moiemeni; of one of the slides from the other, ant}. a turret-carried part rotating go with the turret that controls said means.

2. In alathe, the combination of two slides, mounted independently of each other, a turret on one of said slides, said turretcarrying slide being reciprocable, means whereby movement may be transmitted from the turret-carrying slide to the other slide, and a turret-carrying part rotating w'th the turret to control said means.

3. In a lathe, the combination of a turret- 3-3 carrying slide, a crossslide mounted independently of the latter, means for transmitting movement front the turretcarrying .slide to the cross-slide, and a. turret-carrying part rotating with he turret that controls 55 said. means.

idrln a lathe, the combination of a turret, a slide mounted independent of the turret, means for operating said slide, and a turret-cerried part rotating with the turret that 40 controls said means.

5. in a lathe, the combination of a turret, l1. cross slide, means for moving said cross slide, and means controlling the operation 01'? the cross slide moving means including a turret actuated part.

6. In a lathe, the combination of a turret- ,carrying slide, a. second slide mounted independent of the turret-carrying slide, means for transmitting motion from the turretocarryingslide to the other slide, and means for automatically controlling the operation of said second slide, comprising, a movable arm in the path of a part carried by the turret.

7. In a lathe, the combination of a turretcarrying slide, a cross slide mounted independent of the turret-carryiug slide, mechanism for moving the cross slide, a movable arm carried by the turretcarrying slide,

controlling the operation of the cross slideopcrating mechanism, and a part carried by the turret to actuate said arm.

8. in a lathe, the combination of a turretcarrying slide, a cross slide. rat-l: and pinion as operating; mechanism for the cross slide, an

. tool slide, a cross slide, plurality of toolholders on the cross slide on opnosite sides of the lathe-axis, respectively, a plurality of operating mechanisms for the cross-slide and one of said mechanisms so con tructs and arranged to move the cross-s.- do in direction the reverse of that direction which moved by another mechanism, and

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means for coupling the main slide and any one of said plurality of mechanisms.

11. In a lathe, the combination of a main slide, a cross slide, a plurality of tool holders on the cross slide on opposite sides ofitho lathe axis, respectively, a iiiurility of reciprocating rods for actur-iting the cross slide. one bf the said rods moving; the cross slide in a direction the reverse of that di re'ction in which it moved by another rod, and a. movable arm caried by the main slide that enacts with said rods atdiiterent times. t

12-. In a lathe, the combination of a. main tool slide, a cross slide. a rack bar thereon, two rack bars extending: parallel to the movement of the main slide, and having a pinion between their opposite teeth ing with the rack on the cross slide, a pinion connected to the other pinion engaging said. rack bars, and an arm pivoted to the main slide so as to operate either 0t said two rack bars.

13. In a lathe, the combination of a main slide, a turret thereon, a cross-slide, a re ciprocating rod to actuate the cross-slide, an

arm on the main slide, two parts on the rod adapted to cooperate with the said to cause movement of the rod, first in one direction and then in the opposite direction, and means routine with the turret to move said arm.

1-l.-In a lathe, the combination of two slides, one of which is mounted for movement in two directions, means limiting the movement in one of such directions, said means beingpart of the instrumentality for moving the slide in its other direction, means for opcratively connecting them so that movement of one slide is transmitted to the other, and means whereby the movements of the slide which are in ditterent directions may be successively imparted thereto.

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